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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let arr = [
        { name: "jack", age: 17 },
        { name: "大嘴花", age: 38 },
        { name: "alex", age: 100 },
        { name: "abin", age: 17 },
      ];
      let newArr = [];
      for (let i = 0; i < arr.length; i++) {
        if (arr[i].age >= 18) {
          newArr[newArr.length] = arr[i];
        }
      }
      console.log(newArr);
    </script>
  </body>
</html>
